Thanks, will have to go take another look because the guy said it was a 100 watter, will get a model number off it because the 1987 i stated was his response to the year, although i'm aware there's an 1987 model as well.
It is all original, and i know it came over from japan, having been exported out there years ago, one of the knobs isn't stock but the insides all are. there's one volume volume for each of the 2 high/low inputs.
The reason i'm looking at it is that i fancied a hot rodded marshall sound, and figured an older amp might be the way to go, I'm aware of the de valuation aspect, but £575 isn't a bad price for any valve amp as a basis for modding, so i'm comfortable with that aspect of it.
thanks again for the info